Users of Lenovo ThinkPad laptops may be in for a nasty surprise if they forget their main (supervisor) hard drive password.

The Chinese hardware manufacturer refuses to reset hard drive (BIOS) security passwords for laptops even if they are covered by warranty. Lenovo, which bought IBM's ThinkPad laptop business in 2005, cites security concerns for this established but little-publicised policy.

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You don't need to be a genius to debug a pf.conf firewall ruleset, you just need the guts to run tcpdump